Grinding machine



c. G. FLYGARE E-rAL GRINDING MACHINE Filed Dec. 1'7, 1940 4 SheetS-N-Sheet l EHRL GFL YEHRE ET WHRTEMHDER Nov. 11, 1941.

c. G. FLYGARE ETAL 2 GRINDING MACHINE Filed Dec. 1'7, 1940 4 sheets-$11591 2 Nov. 11, 1941. c. G. FLYGARE EFAL 2,262,721.

GRINDING MACHINE Filed D60. 17, 1940 4 Sheets-Sheet 3 i 10 3 WM EHRL EFL YEHRE 5T5 WHR T .5 MHDEH Nov. 11, 1941. c, FL E 2 2,262,721

GRINDING MACHINE I filed Dec. 17, 1940 4 Sheets-Sheet! CHRL 51F YE'HRE 5T5 WHRT E L/15051? to provide amotor cylindrical grinding machine, as w asmri asl h interior Patented l lov. 11, 1941 Mesa, assignors GRINDING momma Carl Flygare and Stewart S..-Mader, to Norton Company,

Worcester, Worcester,v

Mass a corporation of Massachusetts Application December 11, 1940, Serial No. 310,514

2 Claims. (CL 51-231) The invention relates to grinding machines, and more particularly to a variable speed table driving mechanism for a cylindrical type grinding machine.

One object of the invention is to provide a simple and thoroughly practical cylindrical type grinding machine having a readily controllable variable speed table driving mechanism; Another object of the invention is to provide a variablespeed motor-driven table driving or reciprocating mechanism. Another object of the invention is driven variable speed cone driving mechanism for a grinding machine table.

Another object of the invention is to provide a variable-speed opposed-cone motor driven driving mechanism for a grinding machine table, in which the motor-driven cone-drive s pivotally mounted so. that the center distance between the motor shaft and the drive shaft may be varied to vary, the speed of the table. It is a further object of the invention to provide a motor driven opposed cone variable speed driving mechanism, in which a manually operable, hydraulically actuated control mechanism is provided for controlling the position of the motor so asto vary the speed of the table movement. A further object of the inventionris to provide a motor drivenvariable speed table driving mechanism, in which a fluid pump is utilized to control the position of the driving motor so as to vary the work table speed. Otherobiects in part obvious or in part pointed out hereinafter;

The invention accordingly consists in the fea-- tures of construction, combinations of elements, and arrangements of parts, as will be exemplified in the structure to be hereinafter described,-and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which is shown one of various posible embodiments of the mechanical features oi this invention,

Fig. 1 is a front elevation .of the improved having parts shownf-in section: Fig." tiis a' fragmentaryfrear'eleva table nl s dib h w f W sir-t e; "TZ'I'he table 20 may 'benreciprocated l'o'ngirr -"an'ijen Qt the-table Y 65 the under sideof the table 2|. Agear 38 which I Fig. is, a piping diagram of the hydraulically operated table speed control mechanism;

tioned for a reduced tablespeed.

" A grinding machine has been illustrated inthe drawings, comprising a base In which supports a transversely movable grinding wheel slide ll.

The-wheel slide H is arranged to slide transversely on the base ill on the usual old and well known V and flat ways'mot shown). A grindof the wheel spindle I73.

20 is provided ing wheel I2 is supported on-one end of a wheel spindle [3 which is Journalled in suitable bearings (not shown) in the wheel slide, II. The grinding wheel I2 and its supporting spindle I! are rotated by means of an electric motor it which is mounted onthe upper surface of the wheel slide II. The motor- I4 is provided with a driven multi-V-grooved pulley I5 which is connected by. a multiple V-belt It with a multi- V-grooved pulley II' which is mounted on the end The base III also serves as a longitudinally reciprocable ble 20. The table 20 is arranged to slide longion a flat way 2| and a V-way 22 formed the-upper surface of the base l0. The table The rotatable work 20' is mounted on the left-hand end of the work piece 23 and isiprovided with an upwardly extendin port! iijwhich israrranged to be engaged eheadstock 24. Whenthe head I ,known mechanisms the pin 28 enagingithe dog 28 wil produces/rotary motion ofzth'ework piece 2!.

, ally by. means of a rack and gear mecha- 'nism comprisingtarack bar dependingfrom support for a work supporting 4 v witha rotatable work support for- 5 rotatablyfpupporting a cylindrical work piece 23 a headstock and. a foot-v A headstock v pin '29 carried by a rotatable face. ate, is rotated by any of the "old- I v "lever;

enter; zenjd of a. shaft E42 ersirig iever 4 I is gr s's li i ii fwh are "theftrentedge of the;

t ablx lin q ee eed. re unit; 55' withinthe base of them g ii 136; the: gear reduction 'supportsa gearil' whichgnmeshes; 'with the gear Ill; i'I'he gear 60 is fixed an? e shaiftilia. In this V ph'sitiohoi' theclutch 59, ai'sl ow rotary motion is imparted tothe clutch-Fiend through the shaft a 49 arid'theparts previously describedtoimpart p20 a slow reciprdcatcry motion'ztofthe table it], A gear 68 isufixdly mounted, relative to the f clutch 61. 'II anintermediate speed of thetable r V I 20 is desired-,the clutch member 61 is shifted to- P ward the right (Fig. 1') :to meshithe gear. with a igearg-fis which-is fixedly mounted on a rotatable' shaft'ilq. A gear 673 isialso fixedly mounted on the 5 ,shaft hand meshes with a. gear 6l ;whic h' is flxedly' mounted adjacent to the end oithe shaft 49; It will be readily apparentfrom the foregoir g disl ciosurethatlby manipulation vo1 theciutches 5S andil, a plurality. of difierentspeedcQmbina-f 3;; tipns may be obtained to vary the reciprocatory h speed of .the tab1e 20. The clutch members 59 l and 61 are preferably 'cperativ'elyconnectedtof.

be actuated by levers' (not shownl'mounted on the frontoi' the machine base. h is.

A variable speed motor driven mechanism I provided for driving the table reciprocating mech- 1 am; comprisingga'n electric motor HI whichis xg i -suppoited 'orirthe' uhder., side of a'bracket" 1| "(reg ae arid 4)., Thebracket 'l l 'isepivgtally sup ed; on trunnion studs 1: 7am 13 tu igsgz and" h1 e n t m fi ed vsup t d a. I bracketi'll whieh fisfliixedly mbuntedohjtherear a: 'li.

rts a 'downV- "nut 80 which is"s'crew-threaded o to hreaded i pqrtipn ll of therrxotdrshaftffik. -sionoi the spring 18. serves norm'a H r H 1 pressure tending to maintain-the he's-J6 I and 11 in the relative position'shown '3and-7i' Q I sew pulley 88 which is connected by means of the driving belt 56 with the pulley 51 to transmit a rotary motion to reciprocate the table 20 as desired.

'As shown in Figs. 2, 3 and '7, the driving belt 82 is positioned to transmit the maximum speed,

of the motor to drive the table reciprocating mechanism. In order to vary the effective driving speed of the motor 10, the pivotally mounted bracket Il may be swung in a counter-clockwise direction so as to increase the center distance between the motor shaft and the jack shaft 84. The compression of the spring 18 is adjusted so as to maintain the driving cones "in the desired relationship with the fixed cone I8 to impart-the desired power through the belt 82 in any position of the motor 10. When the bracket H is moved in a counterclockwise direction to increase the center distances between the motor shaft 15 and I the jack shaft 84', the pull on the driving belt 82 will move the slidably keyed driving cone I1 toward the leftiFig. 3), thus compressing the spring I8 so that the driving belt engages the cones 15 and IL-respectively, at a point nearer the axis of the motor shaft 15 (Fig. 8) ,thusv de-,

creasingthe effective driving speed transmitted by the cones I6 and 1.1 so as to reduee th e'efiecg tive driving speed of the motor 10 andgthusprd-f j duce a slower reciprocatory movement of the work table 20. 1 I? It is desirable to provide a mechanism for];

regulating theposition or; the drivingmotor I10 so that the effective driving l speed. thereof may I be readily controlled from the operators con g trol stationiinfront, of the machine. In the preferred form a hydraulically operated mecha the maximum driving speed of the motor. I

In the position of the parts as shown in-Fig.

' 5, the motor I0 is swung into a position so that nismis providedfcomprising a cylinder 80 which ff is readily supported on trunnion studsfl8I and'ff'; 82 (Fig. 3) on the pivotally mounted frame "H." j

A slidably mounted piston 8315 contained within the cylinder 80. The piston 83' is 'connected-to' one end of a piston rod 04 The other endv of f the piston rod 84, is; pivotally connected bymeans j of a stud 85 to a projecting lug 88 which is formed integral with the bracket"; It will. bev readily apparent from the foregoing disclosure that when fluid is passedthrough aapipe 81into :a cylinder chamber 88, the piston 83 being relatively fixed, I the cylinder 80 will move in a direction toward the right (Figs. 2 and 5) to swing the bracket 1I together with the driving motor I0 in a counterber disks I6 and 11 will be; reducedto transmit a reduced ,reciprocatory speed to the work sup'- portlngtable 2o. 41." 4 It is desirable to .provide' a manually operab control mechanism for vcontrolling and ame ing the admission of fluid under pressure ithrough the pipe 81 into the cylinder. chamber 88"and also lever I05 isthen-moved upwardlyto'raise the piston I04 which serves to drawfiuid from they clockwise direction, thus lengthening the center distance between the motorshaft I5 and the jack shaft 84 so thatpthe effective driving speedofi, the motor and the opposed cone driving membracket I08 which in turn is supported on the upper end of the pump I02. The lever I05 is also pivotally connected by means of a stud H0 with the upper -,end of the piston- I04. A ball check valve III is provided at the lower end of the cylinder I03 and is arranged to facilitate admission of fluid from the pipe IOI into a cylinder chamber H2 when the piston, I04'is moved-upwardly but is arranged automatically to close to prevent downward passage of fluid from the cylinder H2. I

An air vent valve H3 is provided in the cylinder' I03 by means of which air within the system may be readily exhausted when desired. I A manually operable threaded sleeve II4 normally holds the valve I I3 closed, that is, fixed to its seat cylinder chamber II2.- A -manually operable valve H6 is interposedibetween the pipes 81 and NI by means of which fluid within the cylinder chamber 88 and the pipe 81 maybe exhausted into the reservoir I 00-when it is desired toobtain its maximum driving speed is imparted to the mechanism. In this position; the piston 83 engages an end cap III-which enoloses the righthand end of thecylinder 80. *Whendt'is' desired to reduce the effective driving speed of the motor,

the valve H8 is closed. The manually operable reservoir I00 and f pipe I0'I through the ball checkvalve [III to fill-the cylinder chamber H2; v I

with fluid; The lever I05 is then moved down ";v wardly." As soon askthe up movement oftheax 'lever I05 ceases, the ball check'valve III closes;,-; I and the down movement of the'lever I05 pro- :duces afdown movement of the'piston I04 which forcesfluid wi-thinf the" cylinder chamber H2 ith rough "the ball 'checkvalve H5 and the pipe i8'l lg into the cylinder chamber 88 to move the "cylind r 8:0tog'etherf with the pivotally mounted bracket-{II- and -motor 10 in a counterclockwise direction so as to increase the center distance- 841 -"D'uring'thismovernent, the pull on the driving'"be'lt. 82 due to the increased ;,center distance I causes-the coneshaped 'di'sk c'l l-l to move away to control the exhaust of fluid therefrom; In the; a.

preferred constructiona hydraulically operated control vsystem is provided comprising a fluid 'rese'rvoir100 which 'isfixedly supported on the machine base I0. The reservoir -,I00 is1connected operable lever I 05 which is fpivotall'y onnected bya'stud-IM tothe upperendofalink]01$ [The lowerend of-the link IOTfis pivotally connected by means of a stud I08 whi'h iis xcarrie'd'bya pression of'thespring'j; U

effective diameteroifjthe'{driving cones} I6 and I1; The change in speed risz'incremental and the extent ofreductionisdetermineda by the number by means of a pipe I0I 'with'a manually operabie ofst'rokes of the-controllever I05andpiston I04.;= iiuid pump I02.- The :iluid p m I02 comprises 1 Ia. fluid cylinder;I '03 havinga eciprocablepiston Y I "I04 'slirlablyf mountedlthfrinf Th "mud-pamper!) I 02 is arranged :jztogbe actuated manually from the cbrie-shaPdj-disk j'litagainst .the com- 8" so; i as to ireduce the near-ens: pump: chamber l; I 2, through the ball check; valve. I10 and pipe,

chamberl88'to move the; cylinder in a direction toward the right (Figs'.=12,fan d 5) which serves .7 to rock the bracket ll'and motor 10 alsoin a -7 clockwise direction to increase the center distance between the motor haft "l5 and the jack shaft- 4 r m between the motor shaft II and the Jack shaft l4, thus decreasing the effective driving speed of the motor to slow down the speed work supporting table 20. y 1 when the motor 10 together with its supportof the ing bracket Ii are positioned to impartareduced driving speed to the mechanism and it is desired to increase the effective speed of the motor 10, th valve 6 is manually opened to allow fluid to exhaust from'the cylinder chamber 9!, through the pipe 91, through the valve lli andthe pipe Iii, into the reservoir lllll. By manipulation of the valve 6, the effective driving speed of the motor 10 may beincreased to the desired extent. I v h The operation of this improved grinding ma- It' will thus be seen that there has been provided by this invention apparatus in which the,

various objects hereinabove set forthtogetherfl with many thoroughly practical advantages are successfully achieved. As many 'possible embodiments maybe made of the above-invention and as many changes might be madein the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings is to be inter preted as illustrative and not in a limiting sense.

We claim:

1.'In a grinding machine having a base, a]

transverselymovable rotatable grinding wheel, a longitudinally reciprocable table, means including a reversing clutch to reciprocate said table,

chine drivingmechanism will be readiIyap-Y."

parent from the foregoing disclosure. 'I'hetable dogs 43 and 44 are adjusted to produce the d6:-

- siredreciprocatory stroke of the table 20. The

speed reduction unit 55 is adjusted to the dej sired and predetermined speed combination by manipulation of the clutches 59 and 61, after which the machine may be set in motion. If 1 a reduction in the effective driving speed of the motor 10 is desired, the valve lliis closed and the pump lever M5 is moved up anddown todraw fluid from the "reservoir I00, through the pipe "II and ball check valve Ill, into the cylin der chamber H2 on the up stroke of thepiston I. 'On the down stroke of the piston I", the fluid within the cylinder chamber III is forced outwardly throughthe ball check valve '1 I I5 and pipe 91 into the cylinder chamber 98 to move the cylinder 90 together with the bracket IT and the motor III, in a counterclockwise direction, thus lengthening the center distance between the motor shaft 15 and the jack shaft 84 to decrease .the effective driving speed of the motor 10. It

wiilbe readily apparent that one or more strokes of the manually operable pump lever I05 may be had to eifectthe desired shifting movement of the motor to reduce its effective driving speed to the desired and predetermined extent. At the .start of the operation of the speed adjusting:

mechanism, if air is encountered within the system, the air vent valve Ill may be opened on the initial stroke of the manually operable pump a rotatable drive shaft in the base, a drivingbelt connecting said shaft with; said clutch, an electric driving motor pivotally mounted on said base, yieldable opposed driving cones on said motor shaft, a driving belt drivingly connecting said shaft and the driving cones, and a fluid pressure system including a piston and cylinder operatively connected to adjust the position of said motor, a fluid pump to conveyfluid under pressure. to said cylinder to swing said motor so as to decrease the effective driving speed of the motor', and means including a valve to con-- trol the exhaustof fluid'from said cylinder to swing said motor so as to increase the effective driving speed of said motors m 2. In a grinding machine havinga base, a transversely movable rotatable grinding wheel, a longitudinally reciprocable table, means includeing a reversing clutch to reciprocate said table,

a rotatable driving shaft in said'base, adriving lever III! to exhaust air from the system, after which the valv may be'closed anderemains closed during th peration of themachine, If the effective of the motor." is reduced and increase the effective driving be accomplished by manual the valveil l8 above describod.l

belt connecting said shaft with said clutch, an 7 electric driving motor pivotally mounted on said base, yieldable opposed driving cones on the motor shaft, a driving belt drivingly connecting said shaft and driving cones, and a fluid pressure "-system including a piston andcylinder oper- 

